diff --git a/aerosandbox/aerodynamics/aero_3D/avl.py b/aerosandbox/aerodynamics/aero_3D/avl.py
index 9d0729a1..8fc8156b 100644
--- a/aerosandbox/aerodynamics/aero_3D/avl.py
+++ b/aerosandbox/aerodynamics/aero_3D/avl.py
@@ -244,7 +244,7 @@ def run(
 
             keystrokes = "\n".join(keystroke_file_contents)
 
-            command = f"{self.avl_command} {airplane_file}"
+            command = [self.avl_command, airplane_file]
 
             ### Execute
             try: